Crystalline hydroxy waxes as oil in water stabilizers for skin cleansing liquid composition

ABSTRACT

A stress stable lathering skin cleansing liquid composition comprising by weight parts of the liquid composition: 
     (a) from about 0.5 parts to 10 parts of a crystalline, hydroxy-containing stabilizer; for example trihydroxystearin; 
     (b) from about 1 part to about 30 parts of lipid skin moisturizing agent; 
     (c) from about 5 parts to about 30 parts of surfactant having a combined CMC equilibrium surface tension value of from 15 to 50; 
     (d) water; 
     wherein said stress stable lathering skin cleansing liquid composition has a Lipid Deposition Value (LDV) of from about 5 to about 100 and wherein the composition is stable for at least two weeks at 100° F.

This is a continuation of application Ser. No. 08/529,258, filed on Sep.15, 1995 now abandoned, and is a continuation-in-part of applicationSer. No. 08/388,961, filed on Feb. 15, 1995 now abandoned.

TECHNICAL FIELD

The present invention relates to personal skin moisturizing andcleansing compositions.

BACKGROUND OF THE INVENTION

Moisturizers are usually applied directly to the skin as leave-onproducts. Personal cleansing products are usually applied with water asa foam or lather and rinsed off with clear water. Ideal rinse offpersonal cleansers should cleanse the skin gently, causing little or noirritation without defatting and or drying the skin and without leavingskin taut after frequent use. Most lathering personal cleansingproducts, bar soaps, liquids and syndet liquids fail in this respect.

Some current commercial personal cleansing liquids claim to "moisturize"the skin. But, most of these current cleansing liquid products do notdeliver an adequate moisturizing benefit. Therefore, users typicallymust moisturize their skin with a separate leave-on product followingcleansing.

It would be highly desirable to improve the delivery of skinmoisturizers from a cleansing liquid composition over the currentcommercial personal cleansing liquids. If this were accomplished itwould provide users with the convenience of obtaining both a cleansingand a moisturizing benefit from a single product.

Dual cleansing and lipid moisturizing liquid compositions are verydifficult to formulate and process. One reason is the cleansingingredients, in general, tend to be incompatible with the lipidmoisturizing ingredients. Another problem is processing on a commercialscale. Yet another problem is getting the lipid in the liquid to depositon the skin of the user. The deposition of lipid moisturizer from theliquid, onto the skin can be very low due to loss of the lipid in thewash and the rinse. Conversely, it can feel too sticky if deposited onthe skin. Still another problem is formulating a dual liquid thatlathers well. Another problem is formulating a dual liquid that isstorage stabile. Yet another problem is formulating a dual liquid thatis stress stable.

The actual deposition of lipid moisturizer from a lathering dual liquidcomposition is essential for effective lipid benefit. No knowncommercial prior art liquid that claims to be a cleansing and lipidmoisturizing liquid, deposits as much 3 micrograms of lipid moisturizerper cm. sq. of washed skin.

U.S. Pat. No. 3,829,563, Barry et al., issued Aug. 13, 1974, disclosesan emollient cleansing liquid and paste composition containing 10-70parts by weight petrolatum with up to 98 parts, preferably, 95-98 parts,having a diameter particle size smaller than 5 microns.

U.S. Pat. No. 5,308,526, Dias et. al., issued May 3, 1994, incorporatedherein by reference, discloses liquid skin compositions with up to 5parts petrolatum wherein 20-80 parts of said petrolatum particles have aparticle size from 10-120 microns.

U.S. Pat. No. 5,312,559, Kacher et al., issued May 17, 1994,incorporated herein by reference, discloses semi-solid compositions of60,000 to 400,00 cps containing 0.5 parts to 15 parts petrolatum havinga particle size distribution in which 20% to 80% of the particles are10-120 microns.

Shelf stable dual skin cleansing liquid composition, as defined herein,are stable for at least two weeks at room temperature. However, suchcomposition are not required to be stable under stress conditions, asdefined below herein.

Therefore, it is an object of the present invention to provide aneffective, yet gentle, dual skin cleansing liquid composition which isstress stable.

It is an object of the present invention to provide an effective, yetgentle, dual skin cleansing liquid composition which actually depositenough lipid on the skin to provide superior skin moisturizing andsensory benefits while maintaining its lathering and cleaningproperties.

SUMMARY OF THE INVENTION

The present invention relates to a stress stable lathering skincleansing liquid composition comprising by weight parts of the liquidcomposition:

(a) from about 0.5 parts to 10 parts of a crystallinehydroxyl-containing stabilizer selected from the group consisting of:

(i) ##STR1## wherein R₁ is -- ##STR2## R₂ is R₁ or H R₃ is R₁ or H

R₄ is C₀₋₂₀ Alkyl

R₅ is C₀₋₂₀ Alkyl, or H

R₆ is C₀₋₂₀ Alkyl or H

R₄ +R₅ +R₆ =C₁₀₋₂₂

and wherein 1≦x+y≦4;

(ii) ##STR3## wherein R₇ is --R₄ (CHOH)_(x) R₅ (CHOH)_(y) R6

M is Na+, K+ or Mg++, or H; and

iii) mixtures thereof;

(b) from about 1 part to about 30 parts of lipid skin moisturizingagent; wherein said lipid has a shear index (n) at 35° C. in the range0.1 to 0.9 and a consistency k at 35° C. in the range 10 to 5,000 poise;

(c) from about 5 parts to about 30 parts of surfactant, wherein saidsurfactant has a combined CMC equilibrium surface tension value of from15 to 50; and

(d) water;

wherein said stress stable lathering skin cleansing liquid compositionhas a Lipid Deposition Value (LDV) of from about 5 to about 1000 andwherein said composition is stable for at least two weeks at 100° F.(38° C.).

DETAILED DESCRIPTION OF THE INVENTION

The present invention can provide a dual cleansing and lipidmoisturizing liquid composition: 1) which produces an abundant, stable,high quality lather, 2) which is an effective skin cleanser, 3) which isvery mild to the skin and ocular mucosae, 4) which actually delivers aneffective amount of a lipid moisturizing agent to the skin of the userduring the wash; 5) which is non-sticky after use, and 6) which isstress stable.

The present liquid is a stress stable lathering skin cleansing liquidcomposition comprising by weight parts of the following liquidcomposition:

(a) from about 0.5 parts to 10 parts of a crystalline hydroxy-containingstabilizer selected from the group consisting of:

(i) ##STR4## wherein R₁ is -- ##STR5## R₂ is R₁ or H R₃ is R₁ or H

R₄ is C₀₋₂₀ Alkyl

R₅ is C₀₋₂₀ Alkyl, or H

R₆ is C₀₋₂₀ Alkyl or H

R₄ +R₅ +R₆ =C₁₀₋₂₂

and wherein 1<x+y<4;

(ii) ##STR6## wherein R₇ is --R₄ (CHOH)_(x) R₅ (CHOH)_(y) R₆

M is Na+, K+ or Mg++, or H; and

iii) mixtures thereof;

(b) from about 1 part to about 30 parts of lipid skin moisturizingagent; wherein said lipid has a shear index at 35° C. in the range 0.1to 0.9 and a consistency k at 35° C. in the range 10 to 5,000 poise;

(c) from about 5 part to about 30 parts of surfactant, wherein saidsurfactant has a combined CMC equilibrium surface tension value of from15 to 50; and

(d) water;

wherein said stress stable lathering skin cleansing liquid compositionhas a Lipid Deposition Value (LDV) of from about 5 to about 1000 andwherein said composition is stable for at least two weeks at 100° F.(38° C.).

GLOSSARY OF TERMS

The term "Shelf Stable Liquid Cleanser," as used herein, is defined as aneat lathering skin cleansing liquid composition that under ambientconditions does not phase separate for at least two weeks, preferablyfor at least six months, and more preferable never.

The term "Stress Stable Liquid Cleanser," as used herein, is defined asa neat lathering skin cleansing liquid composition that under 100° F.(38° C.) condition does not phase separate for at least two weeks,preferably for at least six months, and more preferable never.

The term "Pseudoplastic" as used herein refers to fluids which show amarked decrease in viscosity as shear rate increases. This behavior isalso referred to as shear thinning, which means that the resistance ofthe material to flow decreases as the energy required to sustain flow athigh shear is reduced.

The term "Thixotropy" as used herein is defined as the ability of thesystem to exhibit lower viscosites as a function of shearing and itsability to have its structure reformed over a period of time after theshear is removed.

The term "Crystalline waxes", as used herein, refers to solid waterinsoluble particulates of a wax or waxy substance dispersed in theliquid cleanser. Crystalline waxes are formed via solubilization in thecontinuous phase of liquid composition (above melting point of the wax)followed by rapid cooling.

The term "Water Dispersible Gel Forming Polymer" as used herein meansthat the polymer is water dispersible and forms a gel in water of theliquid cleanser at 5° to 40° C.

Vaughan Solubility Parameter (VSP) is a calculated parameter used todefine a lipid's solubility. Vaughan parameters typically have a rangeof 5-25.

Lipid Deposition Value (LDV) is a measure of how much lip skin fromcompositions herein, the reading corresponds to the amount measuredusing a Sebumeter (typically the mean of three readings), as defined inLipid Deposition Protocol herein.

Equilibrium Surface Tension is a measure of surface tension of asurfactant as measured at the critical micelle concentration at 25° C.;units are dynes/cm.

Consistency, k, is a measure of viscosity, used in combination withShear index, to define viscosity for materials whose viscosity is afunction of shear. The measurements are made at 35° C. and the units arepoise (equal to 100 cps).

Shear index, n, is a measure of viscosity, used in combination withConsistency, to define viscosity for materials whose viscosity is afunction of shear. The measurements are made at 35° C. and the units aredimensionless.

All parts, percentages and ratios used herein are by weight basis andall measurements are at 25° C., unless otherwise indicated.

The dual cleansing and lipid moisturizing liquid compositions of thepresent invention are oil-in-water emulsions. The lipid and aqueousphases of these emulsions, as well as the emulsions themselves and thepreparation thereof, are described in detail as follows.

A. The Aqueous Phase

The aqueous phase of the oil-in-water emulsions of the present inventioncomprises a crystalline, hydroxy-containing stabilizer, a surfactant,and water, along with various optional ingredients. Each of thecomponents of the aqueous phase of the emulsions herein is described indetail as follows.

1. THE CRYSTALLINE, HYDROXYL-CONTAINING STABILIZER

A crystalline, hydroxyl-containing stabilizer is included in the aqueousphase of the emulsions of the present invention. This stabilizer can bea hydroxyl-containing fatty acid, fatty ester or fatty soapwater-insoluble wax-like substance or the like. The stabilizer is usedto form a crystalline stabilizing network in the emulsion that preventsthe lipid droplets from coalescing and phase splitting in the product.The network exhibits time dependent recovery of viscosity after shearing(e.g., thixotropy).

The stabilizers used herein are not surfactants. The stabilizers provideimproved shelf and stress stability, but allow the oil-in-water emulsionto separate upon lathering, and thereby provide for increased lipiddeposition onto the skin. This is particularly true when theoil-in-water cleansing emulsions of the present invention are used inconjunction with a polymeric diamond meshed sponge implement such asthat described in Campagnoli; U.S. Pat. No. 5,144,744; Issued Sep. 8,1992, herein incorporated by reference.

The crystalline, hydroxyl-containing stabilizer comprises from about 0.5parts to 10 parts, preferably from 0.75 to 8 parts, more preferably from1.25 parts to about 5 parts of the liquid cleansing emulsioncompositions herein. The said stabilizer is insoluble in water underambient to near ambient conditions.

The stabilizer is selected from the group consisting of:

(i) ##STR7## wherein R₁ is -- ##STR8## R₂ is R₁ or H R₃ is R₁ or H

R₄ is C₀₋₂₀ Alkyl

R₅ is C₀₋₂₀ Alkyl, or H

R₆ is C₀₋₂₀ Alkyl or H

R₄ +R₅ +R₆ =C₁₀₋₂₂

and wherein 1≦x+y≦4;

(ii) ##STR9## wherein R₇ is --R₄ (CHOH)_(x) R₅ (CHOH)_(y) R₆

M is Na+, K+ or Mg++, or H; and

iii) mixtures thereof,

Some preferred hydroxyl-containing stabilizers include 12-hydroxystearicacid, 9,10-dihydroxystearic acid, tri-9,10-dihydroxystearin andtri-12-hydroxystearin (hydrogenated castor oil is mostlytri-12-hydroxystearin). Tri-12-hydroxystearin is most preferred for usein the emulsion compositions herein.

2. THE LATHERING SURFACTANT

The aqueous phase of the liquid cleansing emulsion compositions of thepresent invention also comprises a lathering surfactant selected fromthe group consisting of anionic surfactants; nonionic surfactants,cationic surfactants, amphoteric surfactants, and mixtures thereof.

The lathering surfactant is defined herein as a surfactant or surfactantmixture thereof that when combined have an equilibrium surface tensionof between 15 and 50 dynes/cm, more preferably between 25 and 40dynes/cm as measured at the CMC (critical micelle concentration) at 25°C. Some surfactant mixes can have a surface tension lower than those ofits individual components.

The personal cleansing and moisturizing liquid emulsion compositionsherein comprise from about 5 part to about 30 parts, preferably fromabout 5 parts to about 25 parts, and most preferably from about 10 partsto about 25 parts of a lathering surfactant.

Anionic surfactants useful herein include: acyl isethionates, acylsarcosinates, alkylglycerylether sulfonates, alkyl sulfates, acyllactylate, methylacyl taurates, paraffin sulfonates, linear alkylbenzene sulfonates, N-acyl glutamates, alkyl sulfosuccinates, alphasulfo fatty acid esters, alkyl ether carboxylates, alkyl phosphateesters, ethoxylated alkyl phosphate esters, alpha olefin sulphates, thealkyl ether sulfates (with 1 to 12 ethoxy groups) and mixtures thereof,wherein said surfactants contain C8 to C22 alkyl chains and wherein thecounterion is selected from the group consisting of: Na, K, NH₄, N(CH₂CH₂ OH)₃. The anionic surfactant is more preferred when selected fromthe group consisting of acyl isethionate, acyl sarcosinates, acyllactylates, alkyl sulfosuccinates, alkylglycerylether sulfonates,methylacyl taurates, alkyl ether sulfates, alkyl sulfates, alkylphosphate esters and mixtures thereof, wherein said surfactants containhas C8 to C14 alkyl chains and is present at a level of from about 8 toabout 20 parts.

Amphoteric synthetic surfactants cannot serve as the sole surfactant inthis product, but are preferred as a co-surfactant at a lower level offrom about 1 part to about 10 parts, by weight and the more preferredtypes are selected from alkyl-ampho mono- and di-acetates, alkylbetaines, alkyl dimethyl amine oxides, alkyl sultaines, alkylamidopropyl betaines, alkyl amidopropyl hydroxysultaines, and mixturesthereof, wherein said surfactants contain C8 to C22 alkyl chains.

Nonionic synthetic surfactant cannot serve as the sole surfactant inthis product, but can be used as a co-surfactant at a lower level offrom about 1 parts to about 15 parts by weight. The more preferred typesselected from the group consisting: alkyl glucose amides, alkyl glucoseesters, polyoxyethylene amides, fatty alkane amides, alkyl amine oxides,alkyl polyglucosides, polyoxy ethylene alkyl phenols, polyoxyethyleneesters of fatty acids, EO/PO block co-polymers such as polyoxamines andpoloxamers, sorbitan esters and alcohol esters, and mixtures thereof.

In a preferred embodiment of the present invention, the liquid emulsionscompositions herein contain from 0.5 parts to 8 parts C8-14 soap; wherethe soap has a counterion selected from the group consisting of K andN(CH2CH20OH)₃, and mixtures thereof, in addition to the latheringsynthetic surfactant.

Cationic synthetic surfactant cannot serve as the sole surfactant inthis product, but are preferred as a co-surfactant at a lower level offrom about 0.5 parts to about 6 parts, by weight. The more preferredtypes of cationic surfactants are selected from the group consisting:alkyl trimonium chloride and methosulfate, and dialkyldimonium chlorideand methyl sulphate, and alkyl alkonium chloride and methyl sulphate andmixtures thereof. These surfactants contain C 12 to C24 carbon atoms peralkyl chain. The most preferred cationic is selected from the groupconsisting of stearalkonium chloride, stearyltrimonium chloride,Di-stearyl-dimonium chloride, and mixtures thereof. Cationic surfactantsmay also act as a lipid deposition aid.

3. WATER

The moisturizing and cleansing liquid emulsion compositions of thepresent invention comprise water as an essential component. The water istypically present at a level of from about 30 parts to about 80 parts,preferably from about 40 parts to about 75 parts, and most preferablyfrom about 40 to about 65 parts of the liquid cleansing emulsions of thepresent invention.

4. OPTIONAL INGREDIENTS

The water phase of the oil-in-water emulsions of the present inventioncan also contain a number of optional ingredients in addition to thecrystalline, hydroxyl-containing stabilizer, surfactant and water.

For example, the liquid cleansing emulsions of the present invention canoptionally include water-dispersible, gel-forming polymers in theaqueous phase of the emulsion. This polymer is preferably a anionic,nonionic, cationic or hydrophobically modified polymer, selected fromthe group consisting of cationic polysaccharides of the cationic guargum class with molecular weights of 1,000 to 3,000,000, anionic,cationic and nonionic homopolymers derived from acrylic and/ormethacrylic acid, anionic, cationic and nonionic cellulose resins;cationic copolymers of dimethyldialkylammonium chloride and acrylicacid; cationic homopolymers of dimethyldialkylammonium chloride;cationic polyalkylene and ethoxypolyalkylene imines polyethylene glycolof molecular weight from 100,000 to 4,000,000; and mixtures thereof.Preferably, the polymer is selected form the group consisting of SodiumPolyacrylate, Hydroxy Ethyl Cellulose, Cetyl Hydroxy Ethyl Cellulose,and Polyquaternium 10.

The polymer is preferably included in the emulsions of the presentinvention at a level of from about 0.1 parts to 1 part, more preferably0.1 parts to 0.5 parts. The polymers can improve the sensory feel of thelipid on skin in addition to providing product stabilization. Theimproved sensory feel results from reduced tackiness and greasiness andimproved smoothness. It is an especially preferred embodiment to usemixture of polymers, some of which are preferred for productstabilization, some are preferred for improved sensory feel. Preferredpolymers to improve sensory feel are selected from the group consisting:of polyethylene glycol, hydroxypropyl guar, guar hydroxypropyltrimoniumchloride, polyquaternary 3, 5, 6, 7, 10, 11 and 24 and mixtures thereof.

Another highly preferred optional component of the present compositionsare one or more humectants and solutes. A variety of humectants andsolutes can be employed and can be present at a level of from about 0.5%to about 25%, more preferably from about 3.0% to about 20%. Thehumectants and solutes are non-volatile, organic materials having asolubility of a least 5 parts in 10 parts water. A preferred watersoluble, organic material is selected from the group consisting of apolyol of the structure:

    R1 --O(CH.sub.2 --CR2HO).sub.n H

where R1=H, C1-C4 alkyl; R2=H, CH₃ and n=1-200; C2-C10 alkane diols;guanidine; glycolic acid and glycolate salts (e.g. ammonium andquaternary alkyl ammonium); lactic acid and lactate salts (e.g. ammoniumand quaternary alkyl ammonium); polyhydroxy alcohols such as sorbitol,glycerol, hexanetriol, propylene glycol, hexylene glycol and the like;polyethylene glycol; sugars and starches; sugar and starch derivatives(e.g. alkoxylated glucose); panthenol (including D-, L-, and the D,L-forms); pyrrolidone carboxylic acid; hyaluronic acid; lactamidemonoethanolamine; acetamide monoethanolamine; urea; and ethanol aminesof the general structure (HOCH₂ CH₂)_(x) NH_(y) where x=1-3; y=0-2, andx+y=3, and mixtures thereof. The most preferred polyols are selectedfrom the group consisting of glycerine, polyoxypropylene(l) glycerol andpolyoxypropylene(3) glycerol, sorbitol, butylene glycol, propyleneglycol, sucrose, urea and triethanol amine.

Preferred water soluble organic material are selected from the groupconsisting of glycerine, polyoxypropylene (1) glycerol andpolyoxypropylene (3) glycerol, sorbitol, butylene glycol, propyleneglycol, sucrose, and urea and triethanolamine.

The use of oil thickening polymers, such as those listed in EP 0 547 897A2 to Hewitt, published 23/06/93, incorporated herein by reference, canalso be included in the water phase of the emulsions of the presentinvention.

A variety of additional ingredients can be incorporated into thecompositions of the present invention. These materials including, butnot limited to, liquid appearance aids, salts and their hydrates andother "filler materials" are listed in U.S. Pat. No. 5,340,492, toKacher et al., issued Aug. 23, 1994, and U.S. Pat. No. 4,919934, toDeckner et al., issued Apr. 24, 1990; which is incorporated herein byreference.

Other non limiting examples of these additional ingredients includevitamins and derivatives thereof (e.g., ascorbic acid, vitamin E,tocopheryl acetate, and the like); sunscreens; thickening agents (e.g.,polyol alkoxy ester, available as Crothix from Croda at levels up to 2%and xanthan gum at levels up to about 2%); preservatives for maintainingthe anti microbial integrity of the compositions; anti-acne medicaments(resorcinol, salicylic acid, and the like); antioxidants; skin soothingand healing agents such as aloe vera extract, allantoin and the like;chelators and sequestrants; and agents suitable for aesthetic purposessuch as fragrances, essential oils, skin sensates, pigments, pearlescentagents (e.g., mica and titanium dioxide), additives to impart a draggyrinse feel (e.g., fumed silica at levels from about 0.5 parts to about 5parts), additives to enhance deposition (e.g., maleated soybean oil atlevels up to 3% or from about 0.5 to about 3 parts), lakes, colorings,and the like (e.g., clove oil, menthol, camphor, eucalyptus oil, andeugenol).

B. The Lipid Phase

The oil-in-water emulsions of the present invention also contain a lipidphase which comprises from about 1 parts to about 30 parts, preferablyfrom about 5 parts to about 30 parts, more preferably from about 10 toabout 25 parts of a lipid skin moisturizing agent. The lipid skinmoisturizing agent provides the skin of the user with a moisturizationbenefit via deposition of the lipid on skin during use. In thisinvention the lipid skin moisturizing agent is defined with scrutiny.The lipid type and its physical properties in this present inventionhold the key to the overall product effectiveness, and is restricted toa hydrophobic material with the following rheological properties.

Two types of rheological parameters are used to define the lipid usedherein. The viscosity of the fluid is represented by consistency (k) andshear index (n). While not being bound by any theory, lipids outside ofthe rheology properties defined herein below are either too easilyemulsified and hence will not deposit, or are too "stiff" to adhere ordeposit on to skin and provide a moisturization benefit. In addition,the rheological properties of the lipid are also important to userperception. Some lipids, on deposition to the skin, are considered toosticky and are not preferred by the user.

    ______________________________________    Lipid Rheological Table 1                  k           n    Range         poise (l/sec)n - 1                              (dimensionless)    ______________________________________    Most preferred                  50-2,000    0.20-5    More Preferred                  10-3,000    0.1-0.5    Preferred      5-5000     0.1-0.9    ______________________________________

As shown in the Lipid Rheological Table above, suitable lipids for useherein have a shear index, n, of from about 0.1 to about 0.9, preferablyfrom about 0.1 to about 0.5, more preferably from about 0.2 to about0.5, and a consistency, k, of: from 5 to 5,000 poise; preferably 10 to3000 poise; more preferably 50 to 2,000 poise at 35° C. The rheology ofsome preferred lipids is set forth in the following table:

    ______________________________________    Lipid Rheological Table 2    Lipids              Consistency, k                                   shear index    ______________________________________    Units               poise      n    Water               0.01       1.0    Microcrystalline Wax (MC)                        **         **    80% Pet/20% MC wax   3926-4822*                                   0.31-33*    91% Pet/9% MC Wax   1983       0.15    Petrolatum          1080-1345  0.24    90% Pet/10% min oil 767-780    0.26    80% Pet/20% min oil 354-430    0.29-0.34    60% Pet/40% min oil 111-115    0.42    40% Pet/60% min oil 4.8-5.3    0.87    Mineral (min) oil   0.81-0.82  1.0    5% SE†/95% min oil                        1580-1787  0.16    95.9% SBO/4.1% MC wax                        780-890    0.13-0.16    80% Pet/20% Polydecene                        283-292    0.32-0.34    65% Pet/35% Polydecene                        115-120    0.4    20% Pet/80% Polydecene                        0.83       0.97-1.0    20% SE†/80% Polydecene                        1897-2035  0.19-0.22    80% Pet/20% Hydrogenated polybutene                        140-585    ______________________________________     *Measured with same instrument, but with 2 cm parallel plate geometry     **Too stiff and solid to obtain readings     †SE solid is a sucrose ester solid and is an example of a preferre     polyol fatty acid polyester, SBO is soybean oil and Pet is petrolatum.

Note that mineral oil, microcrystalline wax and some other lipids bythemselves have rheological properties that are unsuitable for use inthe present liquid compositions; but may be blended with other lipids toprovide acceptable lipid blends.

In some cases, the lipid in this present invention can also be definedin terms of its solubility parameter, as defined by Vaughan in Cosmeticsand Toiletries. Vol. 103, p47-69, October 1988. A lipid having a VaughanSolubility Parameter Value (VSP) of from 5 to 10, preferably 5.5 to 9,more preferably where at least 70% of said lipid has a VSP of 6.5 to7.75 is suitable for use in the liquid compositions herein. The VaughanSolubility Parameters of some preferred lipid moisturization agents areset forth in the Table below.

    ______________________________________    VAUGHAN SOLUBILITY PARAMETER TABLE*    ______________________________________           Cyclomethicone                      5.92           Squalene   6.03           Mineral Oil                      7.09           Petrolatum 7.33           Isopropyl Palmitate                      7.78           Isopropyl Myristate                      8.02           Castor Oil 8.90           Cholesterol                      9.55    ______________________________________     *As reported in Solubility, Effects in Product, Package, Penetration and     Preservation, C. D. Vaughan, Cosmetics and Toiletries, Vol. 103, October     1988.

Notwithstanding the rheological and solubility requirements describedhereinabove, a wide variety of lipid type materials and mixtures ofmaterials are suitable for use in the compositions of the presentinvention. Preferably, the lipid is selected from the group consistingof hydrocarbon oils and waxes, silicones, fatty acid derivatives,cholesterol, cholesterol derivatives, di and tri-glycerides, vegetableoils, vegetable oil derivatives, liquid nondigestible oils such as thosedescribed in U.S. Pat. Nos. 3,600,186 to Mattson; Issued Aug. 17, 1971and 4,005,195 and 4,005,196 to Jandacek et al; both issued Jan. 25,1977, all of which are herein incorporated by reference, or blends ofliquid digestible or nondigestible oils with solid polyol polyesterssuch as those described in U.S. Pat. No. 4,797,300 to Jandacek; issuedJan. 10, 1989; U.S. Pat. Nos. 5,306,514, 5,306,516 and 5,306,515 toLetton; all issued Apr. 26, 1994, all of which are herein incorporatedby reference, and acetoglyceride esters, alkyl esters, alkenyl esters,lanolin and its derivatives, milk -tri-glycerides, wax esters, beeswaxderivatives, sterols, phospholipids hydroxylated milk glyceride,beeswax, spermaceti, myristyl myristate, stearyl stearate carnauba andcandelilla waxes, cholesterol fatty acid esters and homologs thereof,lecithin and derivatives, Sphingo lipids, ceramides, glycosphingo lipidsand homologs thereof and mixtures thereof. Fatty acids, fatty acid soapsand water soluble polyols are specifically excluded from our definitionof a lipid. Thus stearic acid, glycerine and propylene glycol areexcluded from our definition of a lipid.

Hydrocarbon oils and waxes: Some examples are petrolatum, mineral oilmicro-crystalline waxes, polyalkenes (e.g. hydrogenated andnonhydrogenated polybutene and polydecene), paraffins, cerasin,ozokerite, polyethylene and perhydrosqualene. Blends of petrolatum andhydrogenated and nonhydrogenated high molecular weight polybuteneswherein the ratio of petrolatum to polybutene ranges from about 90:10 toabout 40:60 are also suitable for use as the lipid skin moisturizingagent in the compositions herein.

Silicone Oils: Some examples are dimethicone copolyol,dimethylpolysiloxane, diethylpolysiloxane, high molecular weightdimethicone, mixed C1-C30 alkyl polysiloxane, phenyl dimethicone,dimethiconol, and mixtures thereof. More preferred are non-volatilesilicones selected from dimethicone, dimethiconol, mixed C1-C30 alkylpolysiloxane, and mixtures thereof Nonlimiting examples of siliconesuseful herein are described in U.S. Pat. No. 5,011,681, to Ciotti etal., issued Apr. 30, 1991, which is incorporated by reference.

Di and tri-glycerides: Some examples are castor oil, soy bean oil,derivatized soybean oils such as maleated soy bean oil, safflower oil,cotton seed oil, corn oil, walnut oil, peanut oil, olive oil, cod liveroil, almond oil, avocado oil, palm oil and sesame oil, vegetable oilsand vegetable oil derivatives; coconut oil and derivatized coconut oil,cottonseed oil and derivatized cottonseed oil, jojoba oil, cocoa butter,and the like.

Acetoglyceride esters are used and an example is acetylatedmonoglycerides.

Lanolin and its derivatives are preferred and some examples are lanolin,lanolin oil, lanolin wax, lanolin alcohols, lanolin fatty acids,isopropyl lanolate, acetylated lanolin, acetylated lanolin alcohols,lanolin alcohol linoleate, lanolin alcohol riconoleate.

It is most preferred when at least 75% of lipid is composed of lipidsselected from the group consisting: petrolatum, blends of petrolatum andhigh molecular weight polybutene, mineral oil, liquid nondigestible oils(e.g. liquid cottonseed sucrose octaesters) or blends of liquiddigestible or nondigestible oils with solid polyol polyesters (e.g.sucrose octaesters prepared from C22 fatty acids) wherein the ratio ofliquid digestible or nondigestible oil to solid polyol polyester rangesfrom about 96:4 to about 80:20, hydrogenated or nonhydrogenatedpolybutene, micro-crystalline wax, polyalkene, paraffin, cerasin,ozokerite, polyethylene, perhydrosqualene; dimethicones, alkyl siloxane,polymethylsiloxane, methylphenylpolysiloxane and mixtures thereof Whenas blend of petrolatum and other lipids is used, the ratio of petrolatumto the other selected lipids (hydrogenated or unhdyrogenated polybuteneor polydecene or mineral oil) is preferably from about 10:1 to about1:2, more preferably from about 5:1 to about 1:1.

The size of the lipid droplets within the emulsion preferably rangesfrom about 0.1 microns to 100 microns, excluding anomalous very small ora few very large droplets. Preferably greater than 25% of the lipiddroplets are from 5 microns to 120 microns and more preferably at least40% of the lipid droplets are from about 5 microns to 25 microns. Anespecially preferred droplet size range is from 15% to 35% of dropletshaving a droplet size of 0.1 to 5 micron, 15 to 45% having a dropletsize of between 5 and 10 microns, from 30% to 50% having a droplet sizebetween 10 and 25 micron, and less than 15% having a droplet sizegreater than 25 microns. It is a surprising aspect that high levels oflarge droplet size lipid can be stable in a liquid cleansing compositionand also deposit efficacious levels in the washing process. While notbeing bound by theory, larger droplets typically deposit moreefficiently than smaller droplets.

C. The Dual Cleansing and Lipid Moisturizing Liquid Oil-in-WaterEmulsions

Surprisingly, it has been discovered that the emulsions of the presentinvention which contain crystalline hydroxyl-containing stabilizers aremuch more stress stable than emulsions which contain non-hydroxylcontaining crystalline waxes such as ethylene glycol distearate ortristearin. Moreover, as hereinbefore discussed, the dual cleansing andmoisturizing liquid emulsion compositions of the present inventionexhibit good lathering characteristics and are formulated such that aneffective amount of lipid is actually deposited on the skin to providesuperior moisturization benefits.

The deposition of lipid on the skin can be measured via the followinglipid deposition protocol. This protocol is modeled after how skincleansing products are typically used by consumers. The protocol is anin vivo test using at least 6 subjects. The protocol consists of aproduct application stage followed by a determination of the depositedlipid amount. The quantification of lipid is in vivo and as such has awide variance due to differences in skin type and condition. To offsetthis, a balanced design is used to test prototypes; balanced in skintype and using a large base size.

Preparation For Lipid Deposition Protocol

The subject wets the entire surface of the inner forearm with 95°-100°F. tap water for five seconds. The subject then saturates a puff, suchas that described in Campagnoli; U.S. Pat. No. 5,144,744; Issued Sep. 8,1992, and allows the puff to drain for 10 seconds. One milliliter ofproduct is applied to the forearm of the subject and then the product isrubbed with the puff for 10 seconds to generate lather. The lather isallowed to remain on the forearm for fifteen seconds, followed by athorough rinse for fifteen seconds with the water flowing from innerelbow to wrist. The subject arm is then pat dried with a paper towel.The subject then allows the arm to "air" dry for 30 seconds.

Lipid Deposition Protocol

Lipid deposition on the skin is measured using a Sebumeter SM810 whichis commercially available from Courage and Khazaka GmbH and is reportedto be recognized by the scientific world. The Sebumeter measures lipidon the skin via photometry of a special plastic strip, which becomestransparent when it absorbs lipids. The plastic strip is extended over amirror which is connected to a spring. The measuring head of the device(comprised of spring, mirror and plastic strip) is pressed against theskin for 30 seconds. The value (μg/sq. cm) is indicative of the amountof lipid on the skin, and increases with increased amount of lipid. Themethod is insensitive to humidity. Sebumeter readings (3) are takenalong the length of the forearm and the Lipid Deposition Value, LDV,(μg/sq. cm) is defined as the mean of the 3 readings, divided by 0.56for petrolatum containing lipid mixtures. The 0.56 value is a conversionfactor to translate sebumeter readings with petrolatum containing lipidsto actual deposition levels in μg/sq. cm. Lipid deposition values offrom 15 to 200 μg/sq. cm., more preferably from 30 to 150 μg/sq. cm. arepreferred.

The Sebumeter has the following limitations:

1. The Sebumeter tape also detects natural skin lipids. A criterion ofthis test was that subjects baseline value measured on the Sebumeter,prior to washing, be less than or equal to 3 μg/sq. cm of forearm skin.

2. The Sebumeter like other surface extraction measurements may notmeasure all the deposited lipid, if the skin topography is undulating itis possible that deposited lipid may not be extracted by the Sebumetertape.

3. The Sebumeter tape becomes saturated at a LDV of above about 300μg/sq. cm; so this method can be used only for deposition values belowabout 300 μg/sq. cm.

4. Different lipid systems will have different conversion factors. Fortesting non-petrolatum lipids, a new calibration curve is required.

The dual cleansing and moisturizing liquid emulsions of the presentinvention have a Lipid Deposition Value of at least 5 micrograms persquare centimeter. This means that it will deposit at least 5 microgramsof lipid on a square centimeter of forearm skin using the protocoldescribed above.

It is believed that, for certain of the emulsions of the presentinvention, that the rheological properties of the emulsion can have animportant effect on lipid deposition and emulsion stability. Inparticular, it is believed that for some compositions it is desired tohave a high degree of pseudoplasticity (low n and high k value).However, the pseudoplasticity of the emulsion may be of less importancewhen a puff, such as the polymeric diamond mesh sponge described inCampagnoli; U.S. Pat. No. 5,144,744; Issued Sep. 8, 1992, is used toapply the emulsion to the skin. Preferred n and k values to theemulsions of the present invention are set forth in the Table below:

    ______________________________________    Finished Product Rheological Table    Range       k (poise @ (l/sec).sup.n-1                              n (dimensionless)    ______________________________________    More Preferred                250-500       0.20-0.05    Preferred   175-250       0.30-0.20    Less Preferred                100-175       0.40-0.30    ______________________________________

The Carrimed CSL 100 Controlled Stress Rheometer is used to determineShear Index, n, and Consistency, k, for the respective liquid cleansingproduct and lipid herein. The determination is performed at 35° C. withthe 4 cm 2° cone measuring system typically set with a 51 micron gap andis performed via the programmed application of a shear stress (typicallyfrom about 0.06 dynes/sq. cm to about 5,000 dynes/sq. cm) over time. Ifthis stress results in a deformation of the sample, i.e. strain of themeasuring geometry of at least 10-4 rad/sec, then this rate of strain isreported as a shear rate. These data are used to create a viscosity μVs. shear rate γ' flow curve for the material. This flow curve can thenbe modeled in order to provide a mathematical expression that describesthe material's behavior within specific limits of shear stress and shearrate. These results were fitted with the following well accepted powerlaw model (see for instance: Chemical Engineering, by Coulson andRichardson, Pergamon, 1982 or Transport Phenomena by Bird, Stewart andLightfoot, Wiley, 1960):

    Viscosity, μ=k (γ').sup.n-1

The emulsions of the present invention also have good latheringcharacteristics. Lather can be measured according to either of thefollowing tests:

Liquid Hand Lather Test

The hand wash lather test is used to provide in-use lather volumemeasurements for the lather performance of skin cleansing liquids. Thetest measures the lather volume generated under a soil load and withoutsoil. Synthetic soil is used for the test reported herein. Its formulais reported in U.S. Pat. No. 4,673,525 to Small et al. issued Jun. 16th1987, incorporated herein by reference.

The technician washes hands first with Ivory bar before starting test.The technician then passes one hand through 95F city water, leaving alittle water in palm of hand and dispenses 1.7 mls of test product intothat hand. The technician then passes the other hand through the waterand spreads product by rubbing palms together. The product is circulatedon the palm and fingers of the hand 3 times then over the back of thehands once. This procedure is repeated 5 times.

An additional 2 mls of water is added to the hands and the product isagain spread through the hands and circulated as outlined abovecontinuously 5 more times, then the product is gathered/scraped into a250 ml beaker and measured based on volume usually expressed inmilliliters.

Puff Lather Method

Equipment

1-800 ml beaker

1 --potato utensil (waffle design with circular flat bottom)

10 ml syringe timer

95° city water

Olay Body Wash Puff (medium soft, 3 pieces)

Method

1. Fill syringe with 4.5 mls of product.

2. Add 150 mls of 95° city water to beaker.

3. Wet puffin 95° city water for 3 seconds. Squeeze out excess water.

4. Put puff in beaker, string side down.

5. Add product to the puff in a circular motion, covering the surface ofthe puff (not concentrated in the middle).

6. Wet utensil for 3 seconds.

7 Set timer for 30 seconds. Using the utensil, push the puff down to the200 ml marker then bring up to the 600 ml marker (this counts as onetime). Do this procedure 30 times in 30 seconds (each up and down motiontakes 1 second).

8. Take a reading by allowing the utensil to rest on the puff (250 mls)without pressure. Measure the lather height above the utensil. Subtractthe water level (approx. 100 mls.).

The dual moisturizing and cleansing liquid of this invention can be madeby the following process, which utilizes trihydroxystearin as arepresentative stabilizer:

Single Vessel Process

1. Trihydroxystearin is added to distilled water and allowed to mixuntil fully hydrated (appropriate ventilation and dust masks should beworn to prevent inhalation of dust).

2. The surfactants (anionic, amphoteric, cationic and nonionic) areadded and the mixture is heated to 190° F. until the trihydroxystearinis fully melted and dissolved (87.8° C.). While heating, the mixture issubjected to shear via a medium to high agitator speed.

3. The trihydroxystearin dispersion is fast cooled utilizing a plate andframe heat exchanger to a temperature of about 110° F. to 80° F. (43° C.to 27° C.) to form trihydroxystearin crystals. The optimum freeze-outtemperature for the other wax-like stabilizers is determined from thecooling curve of a DSC spectrum.

4. Tetrasodium EDTA and Glydant are added. Perfume is added. The mixtureis continuously stirred at a medium speed.

5. If optional Polymer is to be included, it is added in one of severalways, depending on type. If the polymer is polyquaternium 10 or polyox,it is premixed with glycerin and added as a premix, mixed 5 minutesbefore continuing. Alternatively, Polyquaternium 10 or polyox ispremixed with water and allowed to stir for 10-20 minutes to allowhydration of the polymer.

6. Any additional sensory aids such as silicones are added and allowedto mix 1-2 minutes.

7. The batch is adjusted for water loss by weighing and back adding theamount lost due to evaporation during batch making.

8. A premix of lipid blend, (e.g. polybutene or mineral oil withpetrolatum), at a temperature of 105°-110° F. (40°-43° C.), is added tothe mixture at a temperature of 105°-110° F. (40°-43° C.) and allowed tostir for 2 minutes at a slow to medium setting. The duration andintensity of the mixing after lipid addition is considered important,especially with regards to particle size. Accordingly, if mixed too longor too fast, particle size and the resultant lipid deposition decreases.

EXAMPLES

The following include some non-limiting examples of the presentinvention:

EXAMPLE 1-3

Typical Examples of Products Stabilized with Trihydroxystearin:

    ______________________________________    Ingredients          #1     #2     #3   #4    ______________________________________    Sodium C12/14 Alkyl Ether Glycerol                         11.57  0.00   6.86 12.0    Sulfonate    Ammonium Laureth-3 Sulfate                         3.86   7.38   0.00 3.0    Potassium Myristate  0.00   0.00   6.86 0.0    Myristic Acid        0.00   0.00   0.00 1.0    Myristic Alcohol     0.00   0.00   0.00 1.0    Ammonium Lauryl Sulfate                         0.00   4.92   0.00 0.0    Cocamidopropyl Betaine                         2.57   3.69   2.29 3.0    Trihydroxystearin (Thixcin R) (Stabilizer)                         1.75   2.00   1.75 1.75    Petrolatum           11.60  11.60  11.60                                            0.0    Liquid Cottonseed SPE                         0.00   0.00   0.00 15.3    Solid C.sub.22 SPE   0.00   0.00   0.00 1.20    Hydrogenated Polyisobutene                         2.90   2.90   2.90    Glycerin             6.24   6.24   6.24    Tetrasodium EDTA     0.13   0.13   0.13 0.13    DMDM Hydantoin       0.14   0.14   0.14    Perfume              0.80   0.80   0.80 0.50    Polyquat-10 (JR-30M) 0.00   0.00   0.30 0.30    Glydant              0.00   0.00   0.00 0.20    Maleated Soybean Oil 0.00   0.00   0.00 1.0    Water                59.04  60.19  60.24                                            qs    Volume Lather (ml)   90     85     90   --    Consistency, k (Poise)                         310    355    176  --    Shear Index, n       0.17   0.10   0.29 --    Shelf Stable         Yes    Yes    Yes  Yes    Stress Stable        Yes    Yes    Yes  Yes    ______________________________________

The above examples are shelf stable, stress stable, have good lipiddeposition and good lather. Lather is measured according to the Liquidhand Lather Test set forth herein.

Comparative Examples 5-7

The following Comparative Examples 5-7 comprise non-hydroxy waxes asstabilizers. They are included to demonstrate the novelty and advantagesof the said crystalline hydroxy wax stabilizers of this presentinvention.

    ______________________________________    Ingredients           #5      #6     #7    ______________________________________    Sodium C12/14 Alkyl Ether Glycerol Sulfonate                          11.57   4.27   6.10    Ammonium Laureate-3 Sulfate                          3.86    0.0    0.0    Sodium Lauroyl Sarcosinate                          0.0     0.0    2.0    TEA Lauroyl Sarcosinite                          0.0     2.76   0.0    Potassium Myristate   0.0     4.35   6.30    Cocamidopropyl Betaine                          2.57    0.0    0.0    Myristic Acid         0.0     0.50   0.30    Coco Betaine          0.0     1.97   3.20    Tristearin (Stabilizer)                          2.0     0.0    0.0    Ethylene Glycol Distearate (Stabilizer)                          0.0     7.50   4.15    Propylene Glycol (MW 400,000)                          0.0     0.05   0.0    Carbopol 980 (Stabilizer)                          0.0     0.0    0.50    Polyquat-10 (JR30M)   0.0     0.0    0.30    Petrolatum            11.6    11.6   13.2    Hydrogenated Polyisobutene                          2.9     0.0    2.9    Mineral Oil           0.0     2.9    0.0    Myristyl Alcohol      0.0     0.0    1.0    Glycerin              6.24    6.24   6.24    DMDM Hydantoin        0.14    0.0    0.37    Tetrasodium EDTA      0.13    0      2.00    Perfume               0.8     0.50   0.80    Water                 59.04   57.36  52.94    k (Poise)             60      30     141    n                     0.33    0.26   0.40    Shelf Stable          Yes     Yes    Yes    Stress Stable         No      No     Yes    ______________________________________

The above Comparative Examples are included to demonstrate theadvantages of the emulsions of the present invention with respect tostability. Comparative Examples 5 through 7 are lipid containingmoisturizing liquid cleansing products which utilize as stabilizers twodifferent non-hydroxy waxes and a non-hydroxy wax-polymer combination,respectively.

Comparative Example 5 utilizes tristearin as a stabilizer in exactly thesame matrix and level as was utilized with trihydroxystearin in Example1 above. This comparison is important in that these two molecules areidentical with the exception of 3 hydroxyl groups on trihydroxystearin.Correspondingly, the tristearin prototype exhibits a much lowerconsistency and fails to be stress stable. This is in marked contrast toExample 1 with trihydroxystearin which exhibits much greater consistencyand stress stability. This comparison clearly confirms the importance ofthe hydroxyl groups in achieving a highly pseudoplastic and stressstable liquid cleansing product utilizing crystalline waxes asstabilizers/thickeners. ##STR10##

Example 6 is a moisturizing lipid containing liquid cleanser whichutilizes ethylene glycol distearate as a stabilizer. Ethylene glycoldistearate is a non-hydroxy wax and like tristearin above, thisstabilizer also imparts a rather low consistency and a lack of stressstability to the liquid cleanser.

Example 7 demonstrates that utilizing a stabilizing polymer withethylene glycol distearate can improve the stress stability. However,the addition of the polymer increases the shear index, n, of thecleanser. The only crystalline waxes that were found to be capable ofproviding sufficient stress stability without necessitating a polymerwere the waxes containing hydroxyl groups such as those describedherein. The above information further supports the notion that thepresence of hydroxyl groups on crystalline waxes are key to thisinvention.

Examples 8 through 11 are some further non-limiting examples of thepresent invention.

    ______________________________________                                Exam-                Example 8                       Example 9                                ple 10  Example    ______________________________________    Ammonium Laureth-3                  9.45     9.45     9.45  9.45    sulfate    Ammonium Lauryl sultate                  3.15     3.15     3.15  3.15    Na Lauroamphoacetate                  5.40     5.40     5.40  5.40    Trihydroxystearin                  4.0      4.0      4.0   2.0    Polyquaternium-10                  0.3      0.3      0.3   0.3    Glycerin      3.0      3.0      3.0   3.0    Perfume       0.8      0.8      0.8   0.8    Tetrasodium EDTA                  0.13     0.13     0.13  0.13    Citric Acid   0.76     0.76     0.76  0.76    Petrolatum    16.50    11.20    16.50 --    Polybutene (H1900)                  0.0      4.80     0.0   --    Lauryl Alcohol                  --       --       1.0   2.0    PEG14M    Fumed Silica  0.0      0.0      0.1   1.5    Cottonseed Sucrose                  --       --       --    15.3    Octaester    Sucrose octaesters from                  --       --       --    1.2    C.sub.22 Fatty Acids    Water         Q.S.     Q.S.     Q.S.  Q.S.    Lather Volume (ml)                  400      --       400   --    Lipid Deposition*                  21.4     33.9     23.2  --    Stress Stable Yes      Yes      Yes   --    ______________________________________     *The 0.56 Conversion factor for petrolatum is used here as an     approximation. The Lather volume reported in this table is measured     according to the Puff Lather Method set forth hereinbefore.

What is claimed is:
 1. A stress stable, rinse-off, lathering skincleansing liquid composition comprising by weight parts of the liquidcomposition:(a) from about 0.5 parts to 10 parts of a crystallinetrihydroxystearin (b) from about 1 part to about 30 parts of lipid skinmoisturizing agent having a shear index at 35° C. in the range 0.1 to0.9 and a consistency k at 35° C. in the range 5 to 5,000 poise; (c)from about 5 part to about 30 parts of surfactant having a combinedcritical micelle concentration equilibrium surface tension value of from15 to 50 dynes/cm; and (d) water;wherein said stress stable, rinse-offlathering skin cleansing liquid composition has a Lipid Deposition Value(LDV) of from about 5 to about 1000 μg/sq. cm and wherein said stressstable, rinse-off lathering skin cleansing liquid composition is stablefor at least 2 weeks at 38° C.
 2. The stress stable rinse-off latheringskin cleansing liquid composition of claim 1 wherein said stress stable,rinse-off lathering skin cleansing liquid composition has a shear indexat 35° C. in the range 0.30-0.05 and a consistency k at 35° C. in therange 175-500 poise.
 3. The stress stable rinse-off lathering skincleansing liquid composition of claim 1 which comprises (a) from about0.75 to about 8 parts crystalline, trihydroxystearin, (b) from about 5to about 30 parts lipid skin moisturizing agent, wherein said lipid skinmoisturizing agent has a viscosity consistency k value of 10 poise to3,000 poise at 35° C. and a shear index at 35° C. in the range 0.1 to0.5; (c) from about 5 to about 25 parts of a surfactant having acombined critical micelle concentration equilibrium surface tensionvalue of from 25 to 40 dynes per cm at 25° C.; and (d) from about 30parts to about 80 parts water; wherein said liquid composition has aLipid Deposition Value of 15 to 200 μg/sq. cm.
 4. The stress stable,rinse-off lathering skin cleansing liquid composition of claim 3 whereinsaid lipid skin moisturizing agent is selected from the group consistingof: hydrocarbon oils and waxes, silicones, fatty acid derivatives,cholesterol, cholesterol derivatives, di- and tri-glycerides, vegetableoils, vegetable oil derivatives, liquid nondigestible oils, blends ofliquid digestible or nondigestible oils with solid polyol polyesters,acetoglyceride esters, alkyl esters, alkenyl esters, lanolin and lanolinderivatives, milk triglycerides, wax esters, beeswax derivatives,sterols, phospholipids and mixtures thereof.
 5. The stress stable,rinse-off lathering skin cleansing liquid composition of claim 4 whichcomprises from about 1.25 to about 5 parts of the crystallinetrihydroxystearin.
 6. The stress stable rinse-off lathering skincleansing liquid composition of claim 3 wherein said lipid skinmoisturizing agent is selected from the group consisting of: petrolatum,mineral oil, micro-crystalline waxes, polyalkenes, paraffin, cerasin,ozokerite, polyethylene, perhydrosqualene, dimethicones,cyclomethicones, alkyl siloxanes, polymethylsiloxanes,methylphenylpolysiloxanes, hydroxylated milk glyceride, castor oil, soybean oil, maleated soy bean oil, safflower oil, cotton seed oil, cornoil, walnut oil, peanut oil, olive oil, cod liver oil, almond oil,avocado oil, palm oil, sesame oil, liquid sucrose octaesters, blends ofliquid sucrose octaesters and solid polyol polyesters, lanolin oil,lanolin wax, lanolin alcohol, lanolin fatty acid, isopropyl lanolate,acetylated lanolin, acetylated lanolin alcohols, lanolin alcohollinoleate, lanolin alcohol riconoleate, beeswax, beeswax derivatives,spermaceti, myristyl myristate, stearyl stearate, carnauba andcandelilla waxes, cholesterol, cholesterol fatty acid esters andhomologs thereof, lecithin and derivatives, Sphingo lipids, ceramides,glycosphingo lipids and homologs thereof, and mixtures thereof.
 7. Thestress stable rinse-off lathering skin cleansing liquid composition ofclaim 6, wherein said stress stable, rinse-off lathering skin cleansingliquid composition has a Lipid Deposition Value in the range 30 to 150μg/sq.cm; and wherein at least 75% of said lipid skin moisturizing agentis selected from the group consisting of: petrolatum, blends ofpetrolatum and high molecular weight polybutene, mineral oil, liquidsucrose octaesters, blends of liquid sucrose octaesters and solid polyolpolyesters, hydrogenated or nonhydrogenated polybutene,micro-crystalline wax, polyalkene, paraffin, cerasin, ozokerite,polyethylene, perhydrosqualene; dimethicones, alkyl siloxane,polymethylsiloxane, methylphenylpolysiloxane and mixtures thereof. 8.The stress stable rinse-off lathering skin cleansing composition ofclaim 7 wherein the lipid skin moisturizing agent comprises a blend ofpetrolatum and polybutene in a ratio of from about 5:1 to about 1:1. 9.The stress stable rinse-off lathering skin cleansing composition ofclaim 7 wherein the lipid skin moisturizing agent comprises blends ofliquid sucrose octaesters and solid polyol polyesters in a ratio of fromabout 96:4 to about 80:20.
 10. The stress stable rinse-off latheringskin cleansing liquid composition of claim 7 which comprises from about10 parts to about 25 parts of lipid skin moisturizing agent; and whereinsaid lipid skin moisturizing agent has a consistency k value of 50 to2000 poise, a shear index of from 0.20 to about 0.50.
 11. The stressstable, rinse-off lathering skin cleansing liquid composition of claim 1which comprises from about 5 to about 25 parts surfactant, and whereinsaid surfactant is selected from the group consisting of acylisethionates, acyl sarcosinates, alkylglycerylether sulfonates, alkylsulfates, acyl lactylate, methylacyl taurates, paraffin sulfonates,linear alkyl benzene sulfonates, N-acyl glutamates, alkylsulfosuccinates, alpha sulfo fatty acid esters, alkyl ethercarboxylates, alkyl phosphate esters, ethoxylated alkyl phosphateesters, alpha olefin sulphates, alkyl ether sulfates and mixturesthereof, wherein said surfactants contain C₈ to C₂₂ alkyl chains andwherein the counterion is selected from the group consisting of: Na, K,NH₄, and N(CH₂ CH₂ OH)₃.
 12. The stress stable, rinse-off lathering skincleansing liquid composition of claim 1 which contains additionally from0.1 to about 1 part of a water-dispersible, gel-forming polymer.
 13. Thestress stable, rinse-off lathering skin cleansing liquid composition ofclaim 12 wherein the polymer is selected from the group consisting ofcationic polysaccharides of the cationic guar gum class with molecularweights of 1,000 to 3,000,000; anionic, cationic and nonionichomopolymers derived from acrylic or methacrylic acid; anionic, cationicand nonionic cellulose resins; cationic copolymers ofdimethyldialkylammonium chloride and acrylic acid; cationic homopolymersof dimethyldialkylammonium chloride; cationic polyalkylene andethoxypolyalkylene imines; polyethylene glycol of molecular weight from100,000 to 4,000,000; and mixtures thereof.
 14. The stress stable,rinse-off lathering skin cleansing liquid composition of claim 1 whereinsaid stress stable, rinse-off lathering skin cleansing liquidcomposition additionally comprises from about 0.5 to about 25 partswater soluble, organic material and wherein said water soluble organicmaterial is selected from the group consisting of alkane diols;guanidine; glycolic acid and glycolate salts; lactic acid and lactatesalts; polyhydroxy alcohols; polyethylene glycol; sugars and starches;sugar and starch derivatives; panthenol; pyrrolidone carboxylic acid;hyaluronic acid; lactamide monoethanolamine; acetamide monoethanolamine;urea; and ethanol amines of the general structure (HOCH₂ CH₂)_(x) NH_(y)where x=1-3; y=0-2, and x+y=3, and mixtures thereof; and wherein saidwater soluble organic material is at least 50% soluble in water.
 15. Thestress stable, rinse off lathering skin cleansing liquid composition ofclaim 1 which additionally comprises from about 0.5 parts to about 5parts fumed silica.
 16. The stress stable, rinse-off lathering skincleansing liquid composition of claim 1 which additionally comprisesfrom about 0.5 to about 3 parts of maleated soybean oil.
 17. A personalbath or body cleansing kit comprising:a) a light weight polymericdiamond mesh personal cleansing hand-held sponge; and b) the stressstable, rinse-off lathering skin cleansing liquid composition ofclaim
 1. 18. A stress stable, rinse-off lathering skin cleansing liquidcomposition comprising by weight parts of the liquid composition:(a)from about 1.25 parts to 5 parts of a water insoluble crystallinetrihydroxystearin; (b) from about 10 parts to about 25 parts of lipidskin moisturizing agent having a shear index at 35° C. in the range 0.2to 0.5 and a consistency k at 35° C. in the range 50 to 2,000 poise; (c)from about 10 parts to about 25 parts of surfactant having a combinedcritical micelle concentration equilibrium surface tension value of from15 to 50 dynes/cm; (d) from about 40 to about 65 parts water;whereinsaid stress stable, rinse-off lathering skin cleansing liquidcomposition has a Lipid Deposition Value (LDV) of from about 30 to about150 μg/sq.cm.
 19. The stress stable, rinse-off lathering skin cleansingliquid composition of claim 18 wherein said stress stable lathering skincleansing liquid composition has a shear index at 35° C. in the range0.30-0.05 and a consistency k at 35° C. in the range 175-500 poise.